A study commissioned by an Austrian government minister critical of Vienna's Muslim-run kindergartens has ignited a political fight between the minister's party and rivals seizing on allegations that his staff rewrote parts of the study to make it more negative.

The study's author, a professor at the University of Vienna, says he would never allow his work to be changed, while Foreign and Integration Minister Sebastian Kurz has indirectly denied the allegations.

But the alleged tampering reported by Austrian media was serious enough for the university to announce the study was under review for evidence of possible manipulation.

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